Question details

Unknown Fault Indication of CI840

Hi All,

I experienced strange behavior of CI840A fault indication. At first, I tried to move around the module to some other Remote IO, but it worked fine. So I assumed that module is good.

Then I tried to change TU847 module with the new one (and also with other good CI840A), but fault indication still there. I’m pretty sure that software configuration is all fine. Do we miss some electrical wiring requirement, or maybe some related software configuration?

Hi Sumit, thank you for your response. I've double checked the module installation, and all is OK.

Do you have ABB article about controller recommended installation? I found some problems in this project because of bad cable laying (high voltage and instrument cable separation) and grounding design.

Hi Martin sorry for late reply, regarding AC 900F there is manual M&I mounting and Installation Document "2PAA109295 M&I - AC 900F Controller.pdf" and for S800 I/O can find Document "3BSE020923R5021_-_en_System_800xA_5.0_SP2_S800_I_O_General_Information_and_Installation.pdf"
Both document can be found in ABB Library or in MCS my control system, in myABB portal.